Display screen or a portion thereof with a graphical user interface



The FIGURE is a front view of an image of a display screen or a portion thereof with a graphical user interface according to our design.

The dash-dot broken line is provided for the purposes of illustrating the display screen or portion thereof whereas the even the broken lines illustrates portions of the animated graphical user interface. Neither the display screen nor the graphical user interface shown in broken lines form part of the claimed design. 

CLAIM The ornamental design for a display screen or a portion thereof with a graphical user interface, as shown and described. 